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You are missing more system headers.
Probably string.h and sys/time.h
It is also worth always using the unix '/' in directory paths, rather than the microsoft '\'. The former is valid in almost all microsoft tools.
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After making some change in the original project, I finally passed the compile phase, but when linking, there are errors said the opencv libraries can not be found.
So I think the problem still lies in the incompatibility between nios2-elf-gcc compiled files and the gcc on my computer system(mine is Ubuntu 11.10)
So I think I still need to recompile the opencv libraries by nios2-elf-gcc.
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